1. The interface is awful and terribly slow. I don't feel like you can have filtering as a "coming soon" feature when the entire service is based around filtering. Also, I don't know what sort of awful JS is used to power the site but it really needs to go. It feels extremely sluggish (which after browsing Drew's other sites seems to be a theme).
2. It's built entirely on trust and very limited amounts of information. I feel like one could waste a lot of time contacting and vetting prospective collaborators.
I really want to like services like this; finding fellow designers/developers is difficult whether you have a project in mind or not and is really stodgy outside the comfort of referrals. Sadly, this isn't looking like a great fix to the problem (though it is a start).